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Performs a dns-01 challenge by creating a DNS TXT record.
:param str domain: The domain being validated.
:param str validation_domain_name: The validation record domain name.
:param str validation: The validation record content.
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Ensure that a configuration value is available.
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Ensure that a configuration value is available for a path.
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As `_configure_file`, but for a credential configuration file.
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Always stores absolute paths to avoid issues during renewal.
:param str key: The configuration key.
:param str label: The user-friendly label for this piece of information.
:param dict required_variables: Map of variable which must be present to error to display.
:param callable validator: A method which will be called to validate the
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Prompt the user for a piece of information.
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['foo.bar.baz.example.com', 'bar.baz.example.com', 'baz.example.com', 'example.com', 'com']
:param str domain: The domain for which to return guesses.
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